A "tremendous amount of progress" has been achieved in talks to finalise a US-proposed peace plan to end the Russia-Ukraine war, Secretary of State Marco Rubio has said, BBC reported.

But "there's still some work to be done", Rubio said after meeting Ukrainian and European negotiators in Geneva, Switzerland.

Ukrainian President Volodymyr Zelensky said there were "signals that President [Donald] Trump's team is hearing us".